package demo;

import java.util.concurrent.CountDownLatch;

/**
 * @author noear 2021/3/9 created
 */
public class GuuidUtil {
    private static long machineId = 0;

    private static long datacenterId = 0;
    /**
     * 单例模式创建学法算法对象
     * */
    private enum SnowFlakeSingleton{
        Singleton;
        private SnowFlake snowFlake;
        SnowFlakeSingleton(){
            snowFlake = new SnowFlake(datacenterId,machineId);
        }
        public SnowFlake getInstance(){
            return snowFlake;
        }
    }


    public static long getUUID(){
        return SnowFlakeSingleton.Singleton.getInstance().nextId();
    }

    public static void main(String[] args) {
        CountDownLatch latch = new CountDownLatch(10000);
        long start = System.currentTimeMillis();
        for (int i = 0; i < 10000; i++) {
            new Runnable() {
                @Override
                public void run() {
                    System.out.println(GuuidUtil.getUUID());
                    latch.countDown();
                }
            }.run();
        }
        try {
            System.out.println("主线程"+Thread.currentThread().getName()+"等待子线程执行完成...");
            latch.await();//阻塞当前线程，直到计数器的值为0
            System.out.println("主线程"+Thread.currentThread().getName()+"开始执行...");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.print("雪花算法用时： ");
        System.out.println(System.currentTimeMillis() - start);

    }
}
